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| 1 | +------------------------------------------------------------------------------ |
| 2 | +-- -- |
| 3 | +-- Copyright (C) 2022, AdaCore -- |
| 4 | +-- -- |
| 5 | +-- Redistribution and use in source and binary forms, with or without -- |
| 6 | +-- modification, are permitted provided that the following conditions are -- |
| 7 | +-- met: -- |
| 8 | +-- 1. Redistributions of source code must retain the above copyright -- |
| 9 | +-- notice, this list of conditions and the following disclaimer. -- |
| 10 | +-- 2. Redistributions in binary form must reproduce the above copyright -- |
| 11 | +-- notice, this list of conditions and the following disclaimer in -- |
| 12 | +-- the documentation and/or other materials provided with the -- |
| 13 | +-- distribution. -- |
| 14 | +-- 3. Neither the name of the copyright holder nor the names of its -- |
| 15 | +-- contributors may be used to endorse or promote products derived -- |
| 16 | +-- from this software without specific prior written permission. -- |
| 17 | +-- -- |
| 18 | +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -- |
| 19 | +-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -- |
| 20 | +-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -- |
| 21 | +-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -- |
| 22 | +-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -- |
| 23 | +-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -- |
| 24 | +-- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -- |
| 25 | +-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -- |
| 26 | +-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -- |
| 27 | +-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -- |
| 28 | +-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -- |
| 29 | +-- -- |
| 30 | +------------------------------------------------------------------------------ |
| 31 | + |
| 32 | +with HAL; use HAL; |
| 33 | +with HAL.I2C; use HAL.I2C; |
| 34 | + |
| 35 | +-- I2C 8-bit IO expander with quasi bidirectional I/O, no data |
| 36 | +-- direction, no latch |
| 37 | + |
| 38 | +package PCF8574 is |
| 39 | + |
| 40 | + subtype PCF8574_Address is I2C_Address range 16#40# .. 16#5F#; |
| 41 | + |
| 42 | + type PCF8574_Module (Port : not null Any_I2C_Port; |
| 43 | + Addr : I2C_Address) is tagged limited private; |
| 44 | + |
| 45 | + type Any_PCF8574_Module is access all PCF8574_Module'Class; |
| 46 | + |
| 47 | + |
| 48 | + procedure Set (This : PCF8574_Module; Data : UInt8); |
| 49 | + |
| 50 | + function Get (This : PCF8574_Module) return UInt8; |
| 51 | + procedure Get (This : PCF8574_Module; Data : out UInt8); |
| 52 | + -- when reading the input from keys (buttons) carefully read the |
| 53 | + -- datasheet. The input line should be set high before reading. |
| 54 | + -- E.g. if all lines are key input: |
| 55 | + -- M.Set (16#FF#); |
| 56 | + -- Keys := M.Get; |
| 57 | + |
| 58 | +private |
| 59 | + |
| 60 | + type PCF8574_Module (Port : not null Any_I2C_Port; |
| 61 | + Addr : I2C_Address) is tagged limited null record; |
| 62 | + |
| 63 | +end PCF8574; |
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